[rules-users] exception while adding a packageDescr to a PackageBuilder

I am trying to add a rule to a package. First I create a PackageDescr, then I create a RuleDescr and set some properties in it com.deepak.development.Trade class is loaded into the working memory before I try to create this rule Upon doing a DrlDump, I get the following (which is correctly formed; if I copy paste this in a drl file, the rule gets executed as expected) rule "Added new Rule" when trade : com.deepak.development.Trade( ) then System.out.println("Whatever");end ////////////////////////// // CODE ////////////////////////// //Create a PackageDescr //packages[0] is the package that is already available, //since I create a new PackageDescr with same name, //I expect the new rule to be appended to the existing package final PackageDescr packageDescr = new PackageDescr(new Package(packages[0].getName()).getName()); //Create a RuleDescr RuleDescr ruleDescr = new RuleDescr("Added new Rule"); String consequence = "System.out.println(\"Whatever\");"; AndDescr lhs = new AndDescr(); ruleDescr.setLhs( lhs ); final PatternDescr pattern = new PatternDescr( com.deepak.development.Trade.class.getName(),"trade"); lhs.addDescr( pattern ); ruleDescr.setConsequence( consequence ); PackageBuilder builder = new PackageBuilder(packages[0]); packageDescr.addRule( ruleDescr ); DrlDumper drlDumper = new DrlDumper(); System.out.println("Dumping Package Descriptor for all rules: "+ drlDumper.dump(packageDescr)); //Nullpointer Exception caught builder.addPackage(packageDescr); ruleBase.addPackage(builder.getPackage()); Doing a debug in eclipse I can see that a NullPointerException is caught in the line ###builder.addPackage(packageDescr)### Is there any other property I need to set in packageDescr before it can be added to a builder? I can see the following in the debug section of eclipse PackageStore.read(String) line: 58 The following is shown in the Variables side (in eclispe debug mode) [corresponds to PackageStore] this PackageStore (id=13923) errors ArrayList<E> (id=15898) elementData Object[10] (id=19840) modCount 0 size 0 javaDialectRuntimeData null resourceName "java/lang/Object.class" (id=13925) count 22 hash 0 offset 0 value (id=15896) clazz null -- View this message in context: http://old.nabble.com/exception-while-adding-a-packageDescr-to-a-PackageB... Sent from the drools - user mailing list archive at Nabble.com.